100503961 has 2 divisors, whose sum is σ = 100503962. Its totient is φ = 100503960.

The previous prime is 100503959. The next prime is 100503967. The reversal of 100503961 is 169305001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99620361 + 883600 = 9981^2 + 940^2 .

It is a cyclic number.

It is not a de Polignac number, because 100503961 - 2¹ = 100503959 is a prime.

Together with 100503959, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (100503967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50251980 + 50251981.

It is an arithmetic number, because the mean of its divisors is an integer number (50251981).

Almost surely, 2^100503961 is an apocalyptic number.

It is an amenable number.

100503961 is a deficient number, since it is larger than the sum of its proper divisors (1).

100503961 is an equidigital number, since it uses as much as digits as its factorization.

100503961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 810, while the sum is 25.

The square root of 100503961 is about 10025.1663826592. The cubic root of 100503961 is about 464.9373037604.

Adding to 100503961 its reverse (169305001), we get a palindrome (269808962).

The spelling of 100503961 in words is "one hundred million, five hundred three thousand, nine hundred sixty-one".